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Nature of Operations and Items Impacting Basis of Presentation (Tables)
12 Months Ended
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Gain by Transactions Component
The following represents a summary of the amortization of deferred gains recognized within the financial statements for the periods indicated:
 
Years Ended December 31,
 
2019
 
2018
 
2017
Amortization of deferred gains
$
13.6

 
$
46.4

 
$
90.0